Fig 1. Structure of B-form dsDNA and major/minor grooves arising from base-pair geometry in which the sugar/phosphates split the head-on view of the double helix into 3.6 rad (210 °) and 2.6 rad (150 °), respectively. The phosphate groups that link the sugars of bases in the z axis are in and out of page in this illustration. The major and minor grooves here are not to scale.
